The Emission of the Floral Scent of Four Osmanthus fragrans Cultivars in Response to Different Temperatures

Abstract

Floral scent is an important part of volatile organic compounds (VOCs) emitted from plants, and is influenced by many environmental and endogenous factors. To investigate the influence of temperature on the emission of the floral scent of Osmanthus fragrans, the number of chemical compounds and their relative release amounts from four cultivars of O. fragrans under different temperature treatments, were identified using the solid-phase microextraction (SPME) technique and gas chromatography-mass spectrometry (GC-MS) in this study. Results revealed that the numbers and release amounts of floral scent components were significantly influenced by different temperatures, and depend on different cultivars and different types of compounds. Overall, most cultivars had the largest number of chemical compounds in 19 °C and the numbers of chemical compounds decreased with the increase or decrease in the temperature. Alcohols and ketones were the two main kinds of compounds responding to temperature change. The response of a specific chemical compound to temperature change was different in four cultivars. Generally, linalool, α-ionone, β-ionone, and γ-decalactone accounted for the highest proportion in the nine main compounds, and changes of these four chemical compounds to different temperatures had obvious contributions to the floral scent of O. fragrans. The results obtained provide evidence that temperatures can greatly influence the emission of floral scent.

Floral volatiles identification and molecular differentiation of Osmanthus fragrans by neutral desorption extractive atmospheric pressure chemical ionization mass spectrometry

“…O. fragrans is of high economic value in China . The highly distinct floral fragrance of O. fragrans has been the subject of extensive research . A variety of volatile organic compounds (VOCs) have been identified in O. fragrans flowers, including alcohols, aromatic compounds, ketones, terpenoids, and esters .…”

“…2,3 The highly distinct floral fragrance of O. fragrans has been the subject of extensive research. [4][5][6][7][8] A variety of volatile organic compounds (VOCs) have been identified in O. fragrans flowers, including alcohols, aromatic compounds, ketones, terpenoids, and esters. 4 Some investigations have shown the contributions of certain VOCs to the specific fragrances of particular cultivars.…”

“…[4][5][6][7][8] A variety of volatile organic compounds (VOCs) have been identified in O. fragrans flowers, including alcohols, aromatic compounds, ketones, terpenoids, and esters. 4 Some investigations have shown the contributions of certain VOCs to the specific fragrances of particular cultivars. [5][6][7] The identity of the chemicals responsible for the distinct osmanthus fragrance is of great interest, not only for plant and fragrance studies, but also for the development of cost-effective synthetic formulations with the sweet osmanthus fragrance.…”

“…The conventional analytical method for the molecular analysis of O. fragrans VOCs is gas chromatography/mass spectrometry (GC/ MS), 2,4,6,7,[9][10][11] which has a generally high analytical power for the analysis of VOCs. 12,13 However, heat-sensitive, labile and reactive compounds commonly remain undetected in GC/MS because the analysis requires sample collection, extraction and heating processes.…”

Effects of Exogenous Abscisic Acid (ABA) on Carotenoids and Petal Color in Osmanthus fragrans ‘Yanhonggui’

“…The profound diversity in the total carotenoid concentrations of the two clusters was determined by the transcript levels of OfCCD4 [22]. The main volatile organic compounds in petals of O. fragrans are linalool, α-ionone, β-ionone, and γ-decalactone, and 19 • C would promote the emission of a floral scent [23]. Studies have shown that the biosynthesis of volatile compounds in O. fragrans is caused by the OfCCD4 instead of OfCCD1 [24,25].…”